What is the term for a personal privilege given to someone to use the land?

The correct term for a personal privilege granted to someone to use another person's land is a license. A license allows an individual to perform a specific act on someone else's property without transferring any interest in the property itself. This privilege can be revoked at any time by the property owner, distinguishing a license from other forms of property interests, which often provide a degree of security and permanence.

In real estate terms, both an estate in severalty and a joint tenancy refer to specific types of ownership interests in real property, which involve rights to the property itself, rather than merely the right to use it. Tenancy in common also describes a form of ownership where multiple individuals hold an interest in a property, but again, it does not pertain to a temporary privilege like a license does.